Micro-motion biological fixing device and intra-fracture micro-motion regulation and control method

Abstract

The invention relates to the technical field of medical equipment, in particular to a micro-motion biological fixing device and an intra-fracture micro-motion regulation and control method. The bone fracture plate is fixed to the fracture position through a bone screw, a groove cavity is formed in the bone screw, an insertion rod is inserted into the groove cavity, the periphery of the insertion rod is sleeved with a biomass ring body, and the biomass ring body is located between the inner wall of the groove cavity and the side wall of the insertion rod. A plurality of layers of ring bodies are distributed on the biomass ring body in the radial direction of the biomass ring body, materials of all the layers of ring bodies are arranged to control the biomass ring body to be degraded according to the time sequence, the biomass ring body controls the micro-vibration quantity of the bone screw through the degradation degree of the biomass ring body, and the micro-motion biological fixing device can generate micro-motion according to the set time sequence. The strength of the device can be guaranteed in the early stage of fracture recovery, the fracture recovery strength can be designed into the micro-motion amplitude according to the actual recovery process, and the device has the advantages of being accurate in vibration part and high in adjustability.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a micro-motion biological fixation device and a micro-motion control method within a fracture. Background Art

[0002] In orthopedic surgery, traditional fixation devices usually use materials such as metal screws and bone plates to provide stable support for the fracture site. However, these devices often lack flexibility during the postoperative recovery phase and cannot adapt to changes in the bone healing process, which may lead to complications such as decreased bone density and limited joint function. At the same time, many traditional materials have poor biocompatibility and are prone to induce rejection reactions, thus affecting the patient's recovery process. In addition, traditional fixation devices are usually permanent, which may not only lead to a decrease in bone density, but also limit the function of the joints and affect the patient's long-term health.

[0003] At present, the fixation device is often designed as a micro-motion system or a degradable system, which stimulates bone healing and improves local blood supply through micro-motion, thereby promoting the regeneration of bone tissue. Patent CN111419375B relates to a bidirectional micro-motion locking plate. Compared with the existing bidirectional micro-motion locking plate, although this plate simplifies the implantation process and reduces the difficulty of surgery, it still has many shortcomings. First, the flexibility and range of micro-motion adjustment may be insufficient, which means that it is difficult to achieve fine adaptive adjustment when facing different types of fractures or individual differences, limiting its wide applicability. Secondly, the operation accuracy requirements are high. The doctor needs to ensure the precise fit of the micro-motion block and the slot during the operation. Any slight mistake may affect the fixation effect of the plate, and then affect the stability of bone healing. Summary of the invention

[0004] The purpose of the present invention is to avoid the shortcomings of the prior art and provide a micro-motion biological fixation device, which can micro-motion according to a set time sequence, so that the strength of the device can be guaranteed in the early stage of fracture recovery. The fracture recovery strength can be designed based on the micro-motion amplitude according to the actual recovery process, and has the advantages of precise vibration position and high adjustability.

[0005] To achieve one of the above purposes, the present invention provides the following technical solutions:

[0006] Provided is a micro-motion biological fixation device, comprising a bone screw and a bone plate,

[0007] The bone plate is fixed to the fracture site by bone screws, wherein a groove cavity is provided in the bone screws, and a rod is inserted into the groove cavity.

[0008] A biomass ring body is sleeved on the periphery of the insertion rod, and the biomass ring body is located between the inner wall of the groove cavity and the side wall of the insertion rod.

[0009] The biomass ring body has several layers of ring bodies distributed along its radial direction, and the material of each layer of ring bodies is set to control the degradation of the biomass ring body in time sequence. The biomass ring body controls the micro-vibration amount of the bone screw through its own degradation degree.

[0010] In some embodiments, a protrusion is provided on the circumference of the insertion rod, and the biomass ring body is placed on the protrusion.

[0011] In some embodiments, the protrusion is configured as an annular boss.

[0012] In some embodiments, each layer of the ring body includes plates, which are distributed around the circumference of the insertion rod, and the plates in the same layer of the ring body are connected by transverse support strips, and the plates between adjacent ring bodies are connected by longitudinal support strips.

[0013] In some embodiments, the biomass ring body is a multi-layer structure, and taking a three-layer structure as an example, a first-layer ring body, a second-layer ring body and a third-layer ring body are sequentially arranged from the outside to the inside.

[0014] The degradation rate of the third ring layer is lower than that of the second ring layer.

[0015] The degradation rate of the second ring layer is lower than the degradation rate of the first ring layer.

[0016] When the first ring body is degraded, the second ring body and the third ring body maintain stable mechanical strength.

[0017] In some embodiments, the material of the ring body is one of magnesium metal and its alloys, polylactic acid-glycolic acid copolymer, polylactic acid, polyglycolic acid, polyhydroxybutyrate or hydroxyapatite, or other biodegradable metals, polymers and inorganic materials with sufficient biosafety, wherein the above-mentioned materials are arranged in order of degradation time: magnesium metal and its alloys>polylactic acid-glycolic acid copolymer>polylactic acid>polyglycolic acid>polyhydroxybutyrate>hydroxyapatite.

[0018] In some embodiments, the bone fracture plate includes a main plate body and a plurality of inserts, the main plate body has a mounting slot formed on its surface, and the inserts are embedded in the mounting slots.

[0019] The mounting slot is provided with a first mounting hole, the insert is provided with a second mounting hole, the first mounting hole is aligned with the second mounting hole, and the bone screw is inserted into the first mounting hole and the second mounting hole in sequence.

[0020] The side wall of the insert is provided with an elastic component, and the elastic component abuts against the side wall of the installation slot.

[0021] In some embodiments, the elastic component includes a blind hole groove opened on the side wall of the insert, a spring is placed in the blind hole groove, one end of the spring is connected to the groove wall of the blind hole groove, and the other end of the spring points to and is connected to the top of the side wall of the installation slot.

[0022] In some embodiments, a support cap is inserted into the open end of the blind hole slot, and the end of the spring is connected to the side wall of the installation slot through the support cap.

[0023] Beneficial effects of the micro-biological fixation device of the present invention:

[0024] (1) The micro-motion biological fixation device of the present invention has a groove cavity in the bone screw, a plug rod is inserted in the groove cavity, and a biomass ring body is arranged between the peripheral wall of the plug rod and the inner wall of the groove cavity. The biomass ring body is composed of several layers of ring bodies distributed along its radial direction. By setting the material of each layer of ring body, the biomass ring body is controlled to degrade in time sequence, thereby determining the vibration amplitude of the bone screw over time. This micro-motion helps stimulate bone healing and improve local blood supply, and promotes the regeneration of bone tissue. That is, by adjusting the biomass ring body in the cavity, the degradation topological sequence of the bone screw can be designed, and the bone screw is degraded in a controllable time, sequence and volume within 1 to 2 weeks, thereby generating a micro-motion gap between the screw rod and the threaded sleeve, achieving good mechanical strength in the early postoperative period and the micro-motion characteristics required in the mid-term, effectively solving the problem of insufficient flexibility of traditional fixation devices during the recovery process.

[0025] (2) The micro-motion biological fixation device of the present invention places a biomass ring body in the groove cavity of the screw. The biomass ring body does not directly touch the human body, effectively avoiding the problem of rejection reaction caused by insufficient biocompatibility.

[0026] To achieve the second objective above, the present invention provides the following technical solutions:

[0027] A method for micro-motion regulation in fractures is provided, using the above-mentioned micro-motion biological fixation device, comprising the following steps:

[0028] A fracture recovery plan is formulated according to the patient's fracture condition, and the degradation time of each layer of the biomass ring body is designed to control the micro-motion amplitude of the bone screw, so that the connection strength of the fracture site is guaranteed in the early stage of fracture recovery, and micro-motion can be generated in the later stage of fracture recovery to assist the rapid recovery of the fracture site. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of a bone screw according to an embodiment of the present invention.

[0030] Figure 2 is a cross-sectional view of a bone screw according to an embodiment of the present invention.

[0031] Figure 3 It is a partial cross-sectional view of a bone screw according to an embodiment of the present invention.

[0032] Figure 4 Schematic diagram of the structure of the biomass ring body according to an embodiment of the present invention.

[0033] Figure 5 It is a schematic diagram of the working state of the bone plate and the insert according to the embodiment of the present invention.

[0034] Figure 6 It is a schematic structural diagram of an insert according to an embodiment of the present invention.

[0035] Figure 7 2 is a cross-sectional view of an insert according to an embodiment of the present invention.

[0036] Figure 8 Schematic diagram of the structure of another insert according to an embodiment of the present invention.

[0037] Fig. 9 is a cross-sectional view of another insert according to an embodiment of the present invention.

[0038] Reference numerals

[0039] 1. Bone screw; 2. Bone plate; 3. Groove; 4. Insert rod; 5. Biomass ring; 6. Protrusion; 7. Plate; 8. Horizontal support bar; 9. Longitudinal support bar; 10. Mounting slot; 11. First mounting hole; 12. Second mounting hole; 13. Insert; 14. Blind hole; 15. Support cap; 16. Spring; 17. Locking head screw. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0041] The terms used in the present invention are only for the purpose of describing specific implementation regulations, and are not intended to limit the present invention. The singular forms "a", "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0042] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] Example 1

[0044] The micro-motion biological fixation device disclosed in this embodiment is as follows: Figures 1 to 9 As shown, it includes a bone screw 1 and a bone plate 2.

[0045] The bone plate 2 is fixed to the fracture site by means of a bone screw 1. A groove 3 is provided in the bone screw 1. A rod 4 is inserted into the groove 3.

[0046] The bone plate 2 is connected to the fracture site, and then the bone plate 2 is fixed by the bone screw 1, wherein a groove cavity 3 is opened in the bone screw 1, and the insertion rod 4 is inserted into the groove cavity 3.

[0047] A degradable biomass ring body 5 is sleeved around the insertion rod 4, and the biomass ring body 5 is located between the inner wall of the groove cavity 3 and the side wall of the insertion rod 4.

[0048] When the insertion rod 4 is inserted into the groove cavity 3, there will be a certain gap between the insertion rod 4 and the groove cavity 3. Since the insertion rod 4 is inserted into the biomass ring body 5, the biomass ring body 5 will fill in the gap.

[0049] The biomass ring body 5 has several layers of ring bodies distributed along its radial direction. The material of each layer of ring bodies is set to control the degradation of the biomass ring body 5 in time sequence. The biomass ring body 5 controls the micro-vibration amount of the bone screw 1 through its own degradation degree.

[0050] Since the biomass ring body 5 is composed of several layers of ring bodies, the degradation speed of the biomass ring body 5 from the outside to the inside can be controlled according to the degradation time of each layer of the ring body. The greater the degradation degree of the biomass ring body 5, the greater the micro-vibration of the bone screw 1, so that the vibration amplitude of the entire screw can be controlled according to the patient's fracture condition.

[0051] The above-mentioned micro-motion biological fixation device can accurately adjust the time and amplitude of postoperative micro-vibrations to promote bone healing. It can be controlled to degrade within 1 to 2 weeks after surgery, which not only maintains the initial mechanical strength but also allows later micro-movements, improving the shortcomings of traditional methods. In addition, the device can customize the degradation plan according to the specific situation of the patient, flexibly apply different materials, and improve the treatment effect and personalized needs. The use of biocompatible materials effectively reduces the risk of postoperative complications and improves patient comfort and recovery efficiency. The diversified adjustment mechanism enhances the adaptability of the system, makes the treatment plan more flexible, and improves the postoperative recovery effect overall.

[0052] Specifically,

[0053] The device mainly includes a bone plate 2 and a bone screw 1. The bone plate 2 is fixed to the fracture site by the bone screw 1, which plays a role in stabilizing the fracture site. A groove cavity 3 is provided inside the bone screw 1 for inserting the insertion rod 4. A degradable biomass ring body 5 is sleeved around the insertion rod 4, and the biomass ring body 5 is located between the inner wall of the groove cavity 3 and the side wall of the insertion rod 4. When the insertion rod 4 is inserted into the groove cavity 3, there is a certain gap between the insertion rod 4 and the groove cavity 3, and the biomass ring body 5 is filled in the gap.

[0054] The biomass ring body 5 has several layers of ring bodies distributed along its radial direction. By setting the material of each layer of ring body, the degradation of the biomass ring body 5 in time sequence can be controlled. As the biomass ring body 5 degrades, the greater the degree of degradation, the greater the micro-vibration of the bone screw 1. This design can accurately control the vibration amplitude of the entire screw according to the patient's fracture condition.

[0055] Since the biomass ring body 5 is composed of multiple layers of ring bodies, the degradation time of each layer of the ring body is different, thereby achieving gradual degradation from the outside to the inside. In this way, the micro-vibration amount of the bone screw 1 can be dynamically adjusted to meet the demand for micro-motion during the fracture healing process. This chronological micro-vibration control mechanism helps to promote the healing of the fracture site.

[0056] The bone screw 1 includes a locking head screw 17, the material of which includes but is not limited to stainless steel, titanium alloy, polymer and composite material, etc., and the top of the locking head screw 17 is designed with an anti-falling thread, which can better lock the connection between the nut and the screw and reduce loosening caused by movement or load.

[0057] Furthermore, the locking head screw 17 has a diameter ranging from 2 mm to 8 mm and a length ranging from 15 mm to 50 mm, an inner diameter of the groove cavity 3 ranging from 2 mm to 6 mm and an outer diameter ranging from 4 mm to 8 mm, which is adjusted according to the fracture type and location.

[0058] The in-fold micro-motion control system according to claim 1 is characterized in that a protrusion 6 is provided on the circumferential side of the insertion rod 4, and the biomass ring body 5 is placed on the protrusion 6.

[0059] The protrusions 6 can effectively support the biomass ring body 5, preventing the biomass ring body 5 from falling off during the degradation process and failing to degrade in a set direction. The protrusions 6 enable the biomass ring body 5 to degrade layer by layer according to a predetermined plan.

[0060] Specifically, in this embodiment, a protrusion 6 is provided on the circumferential side of the insertion rod 4, and the biomass ring body 5 is placed on the protrusion 6. The design of the protrusion 6 can effectively support the biomass ring body 5 to prevent it from falling off during the degradation process, thereby ensuring that the biomass ring body 5 is degraded in a set direction and order.

[0061] Specifically, the protrusion 6 on the insertion rod 4 can be an annular structure, and its height and width are designed according to the size of the biomass ring body 5 to ensure that the ring body can be firmly placed on the protrusion 6. Through this structural design, the biomass ring body 5 will not be displaced due to external force or its own gravity during the degradation process, thereby ensuring the precise control of the micro-vibration amount of the bone screw 1.

[0062] In addition, the setting of the protrusion 6 can further optimize the micro-vibration characteristics of the bone screw 1. As the biomass ring body 5 gradually degrades, its support for the insertion rod 4 gradually weakens, thereby allowing the insertion rod 4 to produce a small displacement or vibration in the groove cavity 3. This micro-vibration can be precisely controlled by adjusting the degradation speed and layer distribution of the biomass ring body 5 to meet the micro-motion requirements of different patients during the fracture healing process.

[0063] In this embodiment, the protrusion 6 is configured as an annular boss.

[0064] The annular boss can fully support the degradation process of the entire biomass ring body 5 .

[0065] In this embodiment, each layer of the ring body includes plates 7, which are distributed around the circumference of the insertion rod 4. The plates 7 on the same layer of the ring body are connected by transverse support bars 8, and the plates 7 between adjacent ring bodies are connected by longitudinal supports.

[0066] Each layer of the ring body is formed by the plate 7 and the transverse support strip 8, so that the degradation speed of the single-layer ring body can be controlled by the plate 7 and the support strip to avoid the problem that the ring body of the layer is easy to fall off during the degradation process. In addition, the structure that can be degraded layer by layer includes but is not limited to bioactive coatings, multi-layer implants, layered bone substitutes, porous structures, graded support structures and composite materials.

[0067] In this embodiment, the biomass ring body 5 is sequentially provided with a first ring body, a second ring body and a third ring body from the outside to the inside.

[0068] The degradation speed of the second and third ring layers is lower than that of the first ring layer, and the degradation speed of the third ring layer is lower than that of the second ring layer.

[0069] When the first-layer ring body is degraded, the second-layer ring body and the third-layer ring body maintain stable mechanical strength. When the second-layer ring body is degraded, the third-layer ring body maintains stable mechanical strength.

[0070] Since the degradation time is set, the first layer of the ring body is degraded first, then the second layer of the ring body is degraded, and finally the third layer of the ring body is degraded.

[0071] In this embodiment, the ring body material is one of magnesium metal and its alloys, polylactic acid-glycolic acid copolymer, polylactic acid, polyglycolic acid, polyhydroxybutyrate or hydroxyapatite, wherein the above materials are arranged in order of degradation time as follows: magnesium metal and its alloys>polylactic acid-glycolic acid copolymer>polylactic acid>polyglycolic acid>polyhydroxybutyrate>hydroxyapatite.

[0072] At this time, the degradation time of pure magnesium and its alloys is several months to one year, the degradation time of polylactic acid-glycolic acid copolymer is several months, the degradation time of polylactic acid is 6 months to 2 years, the degradation time of polyglycolic acid is several months to several years, the degradation time of polyhydroxybutyrate is several months to several years, and the degradation time of hydroxyapatite is slowly degraded over several years, so as to achieve different material degradation at different times, so as to achieve long-term controllable time, sequence and volume degradation.

[0073] In this embodiment, the bone fracture plate 2 includes a main plate body and a plurality of inserts 13. The main plate body has a mounting slot 10 formed on its surface. The inserts 13 are embedded in the mounting slot 10.

[0074] The mounting slot 10 is provided with a first mounting hole 11, and the insert 13 is provided with a second mounting hole 12. The first mounting hole 11 is aligned with the second mounting hole 12, and the bone screw 1 is inserted into the first mounting hole 11 and the second mounting hole 12 in sequence.

[0075] The side wall of the insert 13 is provided with an elastic component, and the elastic component abuts against the side wall of the installation slot 10 .

[0076] Since the insert 13 is arranged in the mounting slot 10 of the main body, and the bone screw 1 passes through the main body and the insert 13 through the first mounting hole 11 and the second mounting hole 12, when in use, the vibration of the bone screw 1 causes the insert 13 to vibrate and then the bone plate 2 also vibrates.

[0077] Furthermore, the bone plate 2 includes but is not limited to a traditional micro-motion bone plate 2, a locking micro-motion bone plate 2, a dynamic micro-motion bone plate 2, an adjustable micro-motion bone plate 2, a multi-axial micro-motion bone plate 2 and a biodegradable micro-motion bone plate 2.

[0078] Furthermore, in the traditional micro-motion plate 2, the plate 2 is fixed to the bone by the bone screw 1 to provide basic stability; the locking plate 2 provides a stronger fixation force by the locking screw; the dynamic plate 2 uses elastic material to allow a certain bone movement and promote bone healing; the adjustable plate 2 can adjust the stability according to the healing process; the multi-axial type provides multi-directional support for more complex fractures; the biodegradable plate 2 gradually degrades as the bone heals, avoiding the need for a secondary operation.

[0079] Furthermore, the size range of the main body 201 of the bone plate 2 is generally 100 mm to 200 mm in length, 150 mm to 50 mm in width, and 1 mm to 5 mm in thickness, which is specifically adjusted according to the size and shape of the fracture site of the patient.

[0080] The micro-motion biological fixation device according to claim 2 is characterized in that the elastic component includes a blind hole groove 14 opened on the side wall of the insert 13, a spring 16 is placed in the blind hole groove 14, one end of the elastic spring 16 is connected to the groove wall of the blind hole groove 14, and the other end of the spring 16 points to and is connected to the side wall of the installation slot 10. In practical applications, the spring 16 can also be a micro-motion adjustment mechanism such as a spring, the number of which can be tailored according to the patient's condition, and its materials include but are not limited to medical stainless steel, titanium alloy and certain high-performance polymers (such as polylactic acid and polyamide), which can reduce rejection reactions when used in vivo.

[0081] Different numbers of elastic components can also be used to provide different treatment plans for different patient conditions.

[0082] Furthermore, in addition to adjusting different numbers of elastomeric parts, more diverse elastic divisions can be achieved by adjusting and selecting elastomeric parts with different elastic forces to adapt to the symptoms of more patients.

[0083] Furthermore, the number of heads of the elastic module includes but is not limited to three, and can be flexibly adjusted to suit the conditions of different patients.

[0084] When the insert 13 vibrates under the drive of the bone screw 1 , the spring 16 plays a buffering and resetting role to prevent the entire bone plate 2 from moving significantly.

[0085] In this embodiment, a support cap 15 is inserted into the open end of the blind hole 14 , and the end of the spring 16 is connected to the side wall of the installation slot 10 through the support cap 15 .

[0086] The support cap 15 enables the spring 16 to be stably arranged on the side wall of the insert 13 .

[0087] The device is equipped with both a time-controlled micro-motion bone screw 1 and a micro-motion bone plate 2. When the two are used together, there is no mutual constraint or micro-motion offset behavior. Therefore, the doctor can freely choose a single micro-motion device to achieve single-mode micro-motion or link the two to form a dual-mode collaborative micro-motion according to the actual fracture status of the patient, thereby accelerating postoperative recovery. The device can degrade in a controllable time, sequence and volume within 1 to 2 weeks to produce a micro-motion gap to ensure the initial mechanical strength and later micro-motion characteristics. In addition, the device can customize the degradation plan according to the patient's condition, using different materials layer by layer to achieve the optimal degradation rate and function. The combination of the micro-motion bone plate 2 and the micro-motion screw supports the micro-vibration effect and further promotes bone healing. Overall, the device provides a flexible adjustment mechanism that can optimize the treatment plan according to the specific needs of the patient, reduce rejection reactions, and improve postoperative recovery.

[0088] Example 2

[0089] This embodiment also discloses a method for micro-motion regulation in a fracture, comprising the following steps:

[0090] A fracture recovery plan is formulated according to the patient's fracture condition, and the degradation time of each layer of the biomass ring body 5 is designed to control the micro-motion amplitude of the bone screw 1, so that the connection strength of the fracture site is guaranteed in the early stage of fracture recovery, and micro-motion can be generated in the later stage of fracture recovery to assist the rapid recovery of the fracture site.

[0091] Example 3

[0092] After the patient suffered a tibia and fibula fracture, the doctor chose to perform surgery using the Micro Motion Biological Fixation System to promote fracture recovery.

[0093] The bone screw 1 (the locking head screw 17 has a diameter of 5 mm, a length of 30 mm, an inner diameter of the threaded sleeve of 4 mm, and an outer diameter of 6 mm) is used to stabilize the fracture site, especially the locking head screw 17 and the biomass ring body 5 (the material is polylactic acid-glycolic acid copolymer PLA / PGA, and the degradation period is 2 weeks). These components provide initial fracture stability and mechanical strength. The design of the biomass ring body 5 allows layer-by-layer degradation within 1 to 2 weeks after surgery to produce a micro-motion gap, thereby achieving a micro-motion effect. This micro-motion amplitude is adjustable, usually 0 mm to 1 mm, which helps stimulate the natural healing process of the bone and improve the quality of bone healing. In terms of the micro-motion bone plate 2, the bone plate 2 (length 180m, width 30mm, thickness 3mm) is combined with a single-head insert 202 to provide dynamic support by fine-tuning the fracture position and adaptive locking function. The synergistic effect of the system not only accelerates bone healing, but also significantly reduces complications and postoperative discomfort during fracture fixation, and the micro-motion effect promotes bone regeneration during the healing process.

[0094] Example 4

[0095] After a patient suffers articular cartilage injury, the micro-motion biofixation system is used to repair the cartilage and promote recovery of joint function.

[0096] The bone screw 1 (the locking head screw 17 has a diameter of 4mm, a length of 25mm, an inner diameter of the threaded sleeve of 3.5mm, and an outer diameter of 5.5mm) ensures the stability of the surgical site and reduces the risk of postoperative loosening. The double-head insert 13 in the micro-motion plate 2 (the main body of the plate 2 is 170mm long, 25mm wide, and 3mm thick) provides the function of adjusting the micro-motion effect according to the specific needs of the patient. Through the elastomeric parts (using medical stainless steel spring 16 material), the patient's joint recovery period is effectively supported. The biomass ring body 5 (the material selected is polylactic acid-glycolic acid copolymer PLA / PGA, and the degradation period is 3 weeks) can produce a micro-motion effect during the repair process by degrading layer by layer. The micro-motion amplitude is usually between 0mm and 1mm, which promotes the repair and regeneration of articular cartilage cells. The design of this system reduces the physical burden on the patient, while providing recovery of joint function and optimizing the treatment effect.

[0097] Example 5

[0098] During a complex fracture repair surgery, the micro-motion biofixation system was used to ensure intraoperative stability and promote postoperative bone healing.

[0099] Using a time-controlled micro-motion bone screw 1 (the locking head screw 17 has a diameter of 5 mm, a length of 35 mm, a threaded sleeve inner diameter of 4 mm, and an outer diameter of 6 mm) and a biomass ring body 5 (made of polylactic acid-glycolic acid copolymer PLA / PGA, with a degradation period of 1 to 2 weeks), screw locking provides immediate fracture fixation and support. In the micro-motion bone plate 2, the single-head insert 13 in the bone plate 2 (length 190 mm, width 30 mm, thickness 4 mm) can achieve precise micro-motion adjustment. When pressure is applied, the elastomeric part (using a titanium alloy spring 16) provides a micro-motion amplitude of 0 mm to 1 mm to ensure precise docking of the fracture ends. This micro-motion biological fixation system provides a basis for postoperative recovery by applying the micro-motion function during surgery, which not only accelerates the bone healing process, but also helps restore bone density and joint function, significantly shortens the recovery time, and reduces postoperative complications.

[0100] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0101] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0102] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0103] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A micro-motion biological fixation device, characterized in that: Including bone screws and plates, The bone plate is fixed to the fracture site by bone screws, wherein a groove cavity is provided in the bone screws, and a rod is inserted into the groove cavity. A biomass ring body is sleeved on the periphery of the insertion rod, and the biomass ring body is located between the inner wall of the groove cavity and the side wall of the insertion rod. The biomass ring body has several layers of ring bodies distributed along its radial direction, and the material of each layer of ring bodies is set to control the degradation of the biomass ring body in time sequence. The biomass ring body controls the micro-vibration amount of the bone screw through its own degradation degree.

2. The micro-biological fixation device according to claim 1, characterized in that: The peripheral side of the inserting rod is provided with a protrusion, and the biomass ring body is placed on the protrusion.

3. The micro-biological fixation device according to claim 2, characterized in that: The protrusion is configured as an annular boss.

4. The micro-biological fixation device according to claim 2, characterized in that: Each layer of the ring body comprises plates, which are distributed around the circumference of the insertion rod. The plates in the same layer of the ring body are connected by transverse support strips, and the plates between adjacent ring bodies are connected by longitudinal support strips.

5. The micro-biological fixation device according to claim 2, characterized in that: The biomass ring body is sequentially provided with a first ring body, a second ring body and a third ring body from the outside to the inside. The degradation rate of the third ring layer is lower than that of the second ring layer. The degradation rate of the second ring layer is lower than the degradation rate of the first ring layer. When the first ring body is degraded, the second ring body and the third ring body maintain stable mechanical strength.

6. The micro-biological fixation device according to claim 2, characterized in that: The material of the ring body is one of magnesium metal and its alloys, polylactic acid-glycolic acid copolymer, polylactic acid, polyglycolic acid, polyhydroxybutyrate or hydroxyapatite, wherein the above materials are arranged in order of degradation time as follows: magnesium metal and its alloys>polylactic acid-glycolic acid copolymer>polylactic acid>polyglycolic acid>polyhydroxybutyrate>hydroxyapatite.

7. The micro-biological fixation device according to claim 2, characterized in that: The bone fracture plate comprises a main plate body and a plurality of inserts. The main plate body has a mounting groove on its surface, and the inserts are embedded in the mounting grooves. The mounting slot is provided with a first mounting hole, the insert is provided with a second mounting hole, the first mounting hole is aligned with the second mounting hole, and the bone screw is inserted into the first mounting hole and the second mounting hole in sequence. The side wall of the insert is provided with an elastic component, and the elastic component abuts against the side wall of the installation slot.

8. The micro-biological fixation device according to claim 7, characterized in that: The elastic component includes a blind hole groove opened on the side wall of the insert, a spring is placed in the blind hole groove, one end of the spring is connected to the groove wall of the blind hole groove, and the other end of the spring points to and is connected to the side wall of the installation groove.

9. The micro-biological fixation device according to claim 8, characterized in that: A support cap is inserted into the open end of the blind hole slot, and the end of the spring is connected to the side wall of the installation slot through the support cap.

10. A method for micro-motion control in fracture, characterized in that: The micro-movement biological fixation device according to any one of claims 1 to 9 comprises the following steps: A fracture recovery plan is formulated according to the patient's fracture condition, and the degradation time of each layer of the biomass ring body is designed to control the micro-motion amplitude of the bone screw, so that the connection strength of the fracture site is guaranteed in the early stage of fracture recovery, and micro-motion can be generated in the later stage of fracture recovery to assist the rapid recovery of the fracture site.

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